Organic light-emitting diode pixel structure

ABSTRACT

An OLED (organic light-emitting diode) pixel structure comprises a substrate, first and second control components, first, second, and complementary electrode layers, and first and second light-emitting layers. The first and second control components are disposed above the substrate and electrically coupled to, respectively, the first and second electrode layers. There are first and second neighborhoods defined in the pixel structure, and the substrate traverses both of the neighborhoods. The first electrode layer is disposed in the first neighborhood and comprises a reflective layer. The first light-emitting layer is disposed on and electrically coupled to the first electrode layer. The second electrode layer is transparent and disposed in the second neighborhood. The second light-emitting layer is disposed on and electrically coupled to the second electrode layer. The complementary electrode layer is disposed on and electrically coupled to the light-emitting layers.

CROSS-REFERENCE TO RELATED APPLICATIONS

This application is a continuation of the U.S. application Ser. No.14/619,158, filed Feb. 11, 2015, which claims priority to TaiwanApplication Serial Number 103133650, filed Sep. 26, 2014, all of whichare herein incorporated by reference in their entireties.

TECHNICAL FIELD

The disclosure relates to a transparent dislay technology, moreparticularly to a pixel structure for organic light-emitting diodes(OLEDs).

BACKGROUND

A transparent display using OLEDs can be devided into a display regionand a penetrative region according to pixels of the display. The displayregion is disposed with a pixel structure and actually emits light.Since the penetrative region has nothing inside, the back of the displaycan be seen through a transparent substrate. In a pixel, the penetrativeregion can overlap the display region, be abreast of the display region,or be among mono-chromatic LEDs. Because the area of the active luminousregion is smaller than that of the non-transparent region, thetransparent display usually has a lower brightness and a lower contrastof the background.

SUMMARY

According to one or more embodiments, the disclosure provides an OLEDpixel structure. In one embodiment, the OLED pixel structure has a firstregion and a second region and includes a substrate, a first controlcomponent, a first electrode layer, a first luminous layer, a secondcontrol component, a second electrode layer, a second luminous layer,and an opposite electrode layer. The substrate is extended to the firstregion and the second region. The first control component is located onthe substrate. The first electrode layer is located in the first region,is electrically coupled to the first control component, and includes areflection layer. The first luminous layer is located on the firstelectrode layer and electrically coupled to the first electrode layer.The second control component is located on the substrate. The secondelectrode layer is transparent, is located in the second region, and iselectrically coupled to the second control component. The secondluminous layer is located on the second electrode layer and iselectrically coupled to the second electrode layer. The oppositeelectrode layer is located on the first luminous layer and the secondluminous layer and is electrically coupled to the first luminous layerand the second luminous layer.

According to one or more embodiments, the disclosure provides a display.In one embodiment, the display includes the aforementioned OLED pixelstructures and a driving circuit. The OLED pixel structures are arrangedin a matrix form. The driving circuit drives the first controlcomponents according to first image data to control the first luminouslayers to generate a first image according to the first image data. Thedriving circuit also drives the second control components according tosecond image data to control the second luminous layers to generate asecond image according to the second image data. The first image isopaque, and the second image is transparent or translucent.

BRIEF DESCRIPTION OF THE DRAWINGS

The present disclosure will become more fully understood from thedetailed description given herein below for illustration only and thusdoes not limit the present disclosure, wherein:

FIG. 1 is a block diagram of an OLED pixel structure according to anembodiment of the disclosure;

FIG. 2 is a cross-sectional view of the OLED pixel structure accordingto an embodiment of the disclosure;

FIG. 3 is a top view of the OLED pixel structure according to anembodiment of the disclosure;

FIGS. 4A to 7 are schematic diagrams of the OLED pixel structure indifferent embodiments;

FIG. 8A is a schematic diagram of a display according to an embodimentof the disclosure;

FIG. 8B is a schematic diagram of a pixel matrix in the displayaccording to an embodiment of the disclosure;

FIG. 9A is a schematic diagram of a first image displayed by the firstluminous layer according to an embodiment of the disclosure;

FIG. 9B is a schematic diagram of a second image displayed by the secondluminous layer according to an embodiment of the disclosure;

FIG. 9C is a schematic diagram of a frame image shown on the displayaccording to an embodiment of the disclosure;

FIG. 10A is a schematic diagram of a first image displayed by the firstluminous layer according to another embodiment of the disclosure;

FIG. 10B is a schematic diagram of a second image displayed by thesecond luminous layer according to another embodiment of the disclosure;and

FIG. 10C is a schematic diagram of a frame image shown on the displayaccording to another embodiment of the disclosure.

DETAILED DESCRIPTION

In the following detailed description, for purposes of explanation,numerous specific details are set forth in order to provide a thoroughunderstanding of the disclosed embodiments. It will be apparent,however, that one or more embodiments may be practiced without thesespecific details. In other instances, well-known structures and devicesare schematically shown in order to simplify the drawings.

FIG. 1 is a block diagram of an embodiment of an OLED pixel structure(as referred to pixel structure hereinafter) in the disclosure. Thepixel structure provides two main circuit paths. First one of the twomain circuit paths includes, for example, a first control component (asreferred to control component hereinafter) 101, a first electrode layer131, a first luminous layer (as referred to luminous layer hereinafter)151, and a opposite electrode layer 161 that are electrically coupled toeach other. Second one of the two main circuit paths includes, forexample, a second control component (as referred to control componenthereinafter) 102, a second electrode layer 132, a second luminous layer(as referred to luminous layer hereinafter) 152, and a oppositeelectrode layer 162 that are electrically coupled to each other.

In this embodiment, the control components 101 and 102 respectivelydrive the luminous layers 151 and 152 according to a data signal DT. Insome embodiments, data received by the control components 101 and 102can be different to each other. In other words, the control components101 and 102 are respectively controlled by the control signals S1 and S2separated. For example, the control signals S1 and S2 can be power ordigital control manner. In practice, the first control component 101 canbe controlled by or operate according to the control signal S1, or thefirst luminous layer 151 can indirectly be powered by the control signalS1. When the first control component 101 receives the data signal DT andthe first circuit path is enabled, the first luminous layer 151 betweenthe electrode layers 131 and 161 opposite will be driven to emit light.In an embodiment, the first electrode layer 131 functions as an anodeterminal while the opposite electrode layer 161 functions as a cathodeterminal. In another embodiment, the first electrode layer 131 functionsas a cathode terminal while the opposite electrode layer 161 functionsas an anode terminal.

Similarly, the second control component 102 is controlled by andoperates according to the control signal S2, and the second luminouslayer 152 is indirectly powered by the control signal S2. When thesecond control component 102 receives the data signal through the firstcontrol component 101 or by being connected to the first controlcomponent 101 in parallel and the second circuit path is enabled, thesecond luminous layer 152 between the electrode layers 132 and 162 willbe driven to emit light. In this embodiment, the opposite electrodelayers 161 and 162 are separated from each other. In some embodiments,the luminous layers 151 and 152 share one opposite electrode layer. Inother words, the electrode layers 161 and 162 are the same or areelectrically connected to each other.

FIG. 2 is a cross-sectional view of an embodiment of the OLED pixelstructure in FIG. 1 in the disclosure. The pixel structure furtherincludes a substrate 10 and has a first region and a second region. Thefirst region and the second region correspond to the display region andthe penetrative region in the art, respectively. The substrate 10 isextended to the two regions. The control components 101 and 102 arelocated on the substrate 10. The control components 101 includes a firstthin film transistor (TFT) 11, and the control component 102 includes asecond TFT 12. The first TFT 11 has a first gate terminal 110, a firstsource/a drain terminal 112, 114, and a first channel 113. The firstgate terminal 110 of the first TFT 11 is located on the substrate 10.The first channel 113 is coupled with the terminals 112 and 114 suchthat charges can flow between the terminals 112 and 114. The firstchannel 113 is carried by, for example, semiconductor material. One(e.g. the terminal 114) of the terminals 112 and 114 of the firstcontrol component 101 is electrically coupled to the first electrodelayer 131 in the first region. Specifically, the first electrode layer131 includes a reflection layer 14, and the first electrode layer 131 inFIG. 2 is the conductive part of the first electrode layer. Thereflection layer 14 causes that the first region functions as a displayregion that is opaque and has high contrast. The reflection layer 14 ismade of, for example, metal. In an embodiment, the first electrode layer131 and the reflection layer 14 are not independent and belong to thesame opaque metallic electrode. In other embodiments, the firstelectrode layer 131 is a transparent electrode made of indium tin oxide(ITO) and is electrically coupled to the reflection layer 14 made ofmetal. Moreover, the luminous layer 151 on the substrate 10 at leastoverlaps that of the reflection layer 14 on the substrate 10. In anembodiment, the terminal 114 is electrically coupled to the firstelectrode layer 131 through the reflection layer 14.

Similarly, the second TFT 12 has a second gate terminal 120, a secondsource/a drain terminal 122, 124, and a second channel 123. The secondgate terminal 120 of the second TFT 12 is located on the substrate 10.The second channel 123 is coupled with the terminals 122 and 124 suchthat charges can flow between the terminals 122 and 124. The secondchannel 123 is carried out by, for example, semiconductor material. One(e.g. the terminal 122) of the terminals 122 and 124 of the secondcontrol component 102 is electrically coupled to the second electrodelayer 132 in the second region. In this embodiment, the controlcomponents 101 and 102 are opaque and are disposed in the first region.For a top-emitting pixel structure, the control components 101 and 102are disposed behind the reflection layer 14. In other words, the controlcomponents 101 and 102 can be in the shadow that the reflection layer 14is projected on the substrate 10.

In an embodiment, the pixel structure in FIG. 2 further includes a gateinsulation layer 17 that is on the substrate 10 and also covers on thegate terminals 110 and 120. The control components 101 and 102 arepartially located on the gate insulation layer 17. For instance, thethin film transistors 11 and 12 except their gate terminals 110 and 120are located on the gate insulation layer 17.

The first luminous layer 151 is located on the first electrode layer131, and the second luminous layer 152 is located on the secondelectrode layer 132. In the embodiment, the luminous layers 151 and 152share the opposite electrode layer 16 that is located on the luminouslayers 151 and 152. The first electrode layer 131, the first luminouslayer 151, and the opposite electrode layer 16 are electrically coupledto each other, and the second electrode layer 132, the second luminouslayer 152, and the opposite electrode layer 16 are electrically coupledto each other. The second electrode layer 132 can be made of, forexample, transparent material. The second luminous layer 152, theopposite electrode layer 16, and the substrate 10 can be made of, forexample, transparent or translucent material. Therefore, the secondregion can be a penetrative region with a variable transparence value.When the second control component 102 does not operate, the backlightbehind or under the substrate 10 can pass through the substrate 10 andtravel upon or before the opposite electrode layer 16. When the secondcontrol component 102 operates, the second luminous layer 152 willdisplay images with relative lower contrast.

In this or some embodiments, the first region may overlap the secondregion or not. For example, there is a partition layer 18 between theluminous layers 151 and 152 on the substrate 10, and the first regionand the second region in the partition layer 18 partially overlap eachother along the horizontal direction of FIG. 2. The first electrodelayer 131 may be not electrically coupled to the second electrode layer132 or the second luminous layer 152 and the second electrode layer 132may be not electrically coupled to the first luminous layer 151.

In an embodiment, the pixel structure further includes at least one flatlayer 19 at least in the first region, especially on the thin filmtransistors 11 and 12, such that the first electrode layer 131 can beformed on the smooth surface. The flat layer 19 can be made of, forinstance, silicon nitride.

Please refer to FIG. 3 that illustrates a top view of an embodiment ofthe OLED pixel structure in FIG. 2. FIG. 3 does not show the oppositeelectrode layer 16 in FIG. 2. The pixel structure includes, for example,first luminous layers 151R, 151G and 151B in the first region andincludes, for example, second luminous layers 152R, 152G and 152B in thesecond region. The first luminous layers 151R, 151G and 151B areelectrically coupled to the first electrode layer, and the secondluminous layers 152R, 152G and 152B are electrically coupled to thesecond electrode layer. The first luminous layers 151R, 151G and 151Bare separated from the second luminous layers 152R, 152G and 152B by thepartition layer 18. In this or some embodiments, the partition layer 18may be also formed among the first luminous layers 151R, 151G and 151Bor among the second luminous layers 152R, 152G and 152B. The luminouslayers 151R and 152R emit red light, the luminous layers 151G and 152Gemit green light, and the luminous layers 151B and 152B emit blue light.Therefore, red, green and blue light emitted by these luminous layers inthe pixel structure can be mixed to form full color. In FIG. 3, thefirst luminous layers 151R, 151G and 151B are marked by dense meshes topresent that the first region is opaque because of the reflection layer14, and the second luminous layers 152R, 152G and 152B are marked bysparse meshes to present that the second region is transparent ortranslucent. Since pixels for an entire frame image shown on the displayare adjacent, each first luminous layer is regularly adjacent to one ofthe second luminous layers.

The following exemplary embodiments of pixel structure derived from FIG.1 are laid below. As shown in FIG. 4A, the control components 101 and102 are carried out by n-type metal-oxide-semiconductor field-effecttransistors (nMOSFET). As shown in FIG. 4A, the switch unit 103 a (e.g.an nMOSFET) controlled by the scan signal SC cooperates with thecapacitor C to support the control components 101 and 102 to receive thedata signal DT. The scan signal SC can cause the switch unit 103 a on oroff. When the switch unit 103 a is on, the data signal DT is sent to thefirst gate terminal 110 so the first TFT 11 can provide the luminouslayer 151 with electricity according to the data signal DT. In practice,the first gate terminal 110 is electrically coupled to the switch unit103 a, the terminal 112 receives the input voltage OVDD, and thecapacitor C affects the voltage between the first gate terminal 110 andthe terminal 114. The second control component 102 further includes aswitch unit 127. The gate terminal of the switch unit 127 is controlledby a switch signal EM, and the source or drain terminal receives theinput voltage OVDD. Similar to the control components 101 and 102 inFIG. 1 respectively controlled by the control signals S1 and S2, theinput voltage to the first TFT 11 and the switch unit 127 can be theinput voltage OVDD or be different. The terminal 124 of the second TFT12 is electrically coupled to the switch unit 127, and the terminal 122is electrically coupled to the second electrode layer 132. The secondgate terminal 120 of the second TFT 12 is electrically coupled to theswitch unit 103 a, the first gate terminal 110, and the capacitor C toreceive the data signal DT. In other embodiments, the second gateterminal 120 of the second TFT 12 is electrically coupled to other dataresources. In other embodiments, the first gate terminal 110 of thefirst TFT 11 is electrically coupled to a first data line, and thesecond gate terminal 120 of the second TFT 12 is electrically coupled toa second data line. Two data signals respectively provided by the firstdata line and the second data line are different. In other words, thedata signal (referred to as the first data signal) sent from the firstdata line to the first control component 101 and the data signal(referred to as the second data signal) sent from the second data lineto the second control component 102 have difference in data contenttherebetween such that the luminous layers 151 and 152 may have adifference in performance therebetween. The electrode layers 131 and 132are electrically coupled to the luminous layers 151 and 152,respectively. In this embodiment, the luminous layers 151 and 152 areelectrically connected to the opposite electrode layer 16, as shown bythe output voltage OVSS in FIG. 4A.

The operation of the pixel structure is described as follows byreferring to FIGS. 2 and 4A. When the scan signal SC to the gateterminal of the switch unit 103 a is at a high voltage level, the switchunit 103 a will be on such that the data signal DT passes through theswitch unit 103 a to power the first gate terminal 110 of the first TFT11 and the capacitor C. Since the switch unit 103 a is turned on, thecapacitor C stores electricity and voltage level of the data signal DTand changes the voltage difference between the gate terminal and sourceterminal of the first TFT 11 so as to control the current flowingthrough the first TFT 11. The first luminous layer 151 is driven to emitlight according to the current generated from the voltage distancebetween the input voltage OVDD and an output voltage OVSS and theequivalent circuit load. When the scan signal SC at the gate terminal ofthe switch unit 103 a is at a low voltage level, the switch unit 103 awill be off and the data signal DT will be blocked by the switch unit103 a. Therefore, the first TFT 11 is off, and the first luminous layer151 does not emit light.

As shown in FIG. 4A, when the switch unit 103 a is on according to thescan signal SC, the capacitor C decides the voltage on the second gateterminal 120 of the second TFT 12. When the switch signal EM to the gateterminal of the switch unit 127 is at a high voltage level, the switchunit 127 will be on and the data signal DT will control the currentflowing through the second TFT 12. Therefore, the second luminous layer152 is driven to emit light according to the current generated by thevoltage difference between the input voltage OVDD and the output voltageOVSS and the equivalent circuit load. When the scan signal SC to thegate terminal of the switch unit 103 a is at a low voltage level or whenthe switch signal EM to the gate terminal of the switch unit 127 is at alow voltage level, the switch unit 103 a or the switch unit 127 will beoff. Herein, the data signal DT will be blocked by the switch unit 103a, and the current to the switch unit 127 and the second TFT 12 will beblocked by the switch unit 127. Therefore, when the switch unit 103 a orthe switch unit 127 is off, the second luminous layer 152 will not emitlight.

In another embodiment, the control components 101 and 102 are carriedout by p-type metal-oxide-semiconductor field-effect transistors(pMOSFET). As shown in FIG. 4B, the switch unit 103 b (e.g. a pMOSFET)controlled by the scan signal SC cooperates with the capacitor C tosupport the control components 101 and 102 to receive the data signalDT.

It shoulde be notice that the thin film transistors 11 and 12 may bedifferent or the same in standard or size, and the switch unit 103 a (or103 b) and the switch unit 127 may be different or the same in standardor size. In practice, the luminous layers 151 and 152 can achieve thebest brightness scheme by adjusting the aspect ratios of the TFTs 11 and12 during the manufacture, whereby the actively-display and transparencyof the pixel structure may harmonize.

In another embodiment shown in FIG. 4C, the terminal 124 of the secondTFT 12 receives the input voltage OVDD, and the terminal 122 of thesecond TFT 12 is coupled with the second electrode layer 132 through theswitch unit 127. Therefore, the second gate terminal 120 and theterminal 124 have a stable and higher voltage therebetween, therebypositively affecting the current passing through the second luminouslayer 152 and the brightness of light emitted by the second luminouslayer 152. The locations of the second TFT 12 and the switch unit 127 inFIG. 4C are the reverse of those in FIG. 4B. The control components 101and 102 and the switch unit 103 b in FIG. 4C are carried out bypMOSFETs. The switch unit 103 b is controlled by the scan signal SC. Thecapacitor C affects the voltage difference between the first gateterminal 110 and the terminal 112. The first gate terminal 110 of thefirst TFT 11 and the second gate terminal 120 of the second TFT 12 arecoupled with the switch unit 103 a and the capacitor C to receive thedata signal DT.

FIG. 5A is a schematic diagram of an embodiment of an OLED pixelstructure in the disclosure. The pixel structure mainly has two maincircuit paths, the first one includes a first control component 101, afirst electrode layer 131, a first luminous layer 151, and a oppositeelectrode layer 161, and the second one includes a second controlcomponent 102, a second electrode layer 132, a second luminous layer152, and a opposite electrode layer 162. The first control component101, the first electrode layer 131, the first luminous layer 151, andthe opposite electrode layer 161 are electrically coupled to each other,and the second control component 102, the second electrode layer 132,the second luminous layer 152, and the opposite electrode layer 162 areelectrically coupled to each other.

The control component 101 receives a data signal DT to drive the firstluminous layer 151, and the control component 102 receives a data signalDT′ to drive the second luminous layer 152. Alternately, the controlcomponents 101 and 102 can receive other different data, that is, thecontrol components 101 and 102 are controlled by two independent controlsignals S1 and S2, respectively. For example, the control signals S1 andS2 are power or digital control manner. In practice, the control signalS1 can drive the first control component 101 to operate or not or canindirectly provide the first luminous layer 151 with electricity. Whenthe first control component 101 under operation receives the data signalDT, the first circuit path is enabled and the first luminous layer 151between the opposite electrode layers 131 and 161 is driven to emitlight. In an embodiment, the first electrode layer 131 is anode as theopposite electrode layer 161 is cathode. In another embodiment, thefirst electrode layer 131 is cathode as the opposite electrode layer 161is anode.

In practice, the second control component 102 and the first controlcomponent 101 can respectively connect to different data sources.Therefore, the penetrative region of the pixel structure can have highercontrast and brightness, and the first luminous layer and the secondluminous layer in the same pixel are driven by different data to formtwo different images that are combined to form a frame image shown onthe display. By modulating the currents respectively flowing through theluminous layers 151 and 152, the image formed by the display region andthe image formed by the penetrative region can be combined by anysuitable ratio, and alternately, pixels in the penetrative region candisplay an image different from that displayed by the display region(i.e. a non-penetrative region). As shown in FIG. 5B, the switch unit103 c is controlled by the scan signal SC cooperates with the capacitorC′ to support the second control component 102 to receive a data signalDT′. The switch unit 103 c and the switch unit 103 b are synchronous.The second gate terminal 120 of the second TFT 12 is electricallycoupled to the switch unit 103 c, the terminal 122 of the second TFT 12is electrically coupled to the second electrode layer 132 and the secondluminous layer 152 through the switch unit 127. The terminal 124 issupplied with the input voltage OVDD. The capacitor C′ affects andstores the voltage between the terminal 124 and the second gate terminal120. The input voltage OVDD, the scan signal SC, and the switch signalEM in FIG. 5B can correspond to the control signals S1 and S2 in FIG.5A. The luminous layers 151 and 152 are electrically connected to theopposite electrode layers 161 and 162 respectively, as shown by theoutput voltage OVSS in FIG. 5B. In one embodiment, the oppositeelectrode layers 161 and 162 belong to the opposite electrode layer 16in practice. Alternately, the opposite electrode layers 161 and 162 areseperated from each other and respectively belong to two independentelectrodes in physical structure. The operation of the circuit in FIG.5B can be referred to that in FIG. 4A and will not be repeatedhereinafter.

The above brightness scheme can dynamically be changed. In practice, thesubstrate 10 is also in a third region of the pixel structure, and thepixel structure can further include a third control component 102′ onthe substrate 10 (e.g. on the first region). As shown in FIG. 6 and FIG.7, the third control component 102′ includes the third TFT 12′ and thethird switch unit 127′. The third TFT 12′ and the third switch unit 127′are connected in series. The gate terminal of the third TFT 12′ iscoupled with the switch unit 103 b and is controlled by the scan signalSC. In an embodiment shown in FIG. 6, the third control component 102′isconnected to the second control component 102 that includes the secondTFT 12 and the switch unit 127 connected in series in FIG. 4. The thirdswitch unit 127′ is coupled with the second electrode layer 132. The TFT12 and 12′ can have difference in aspect ratio so that no matter whenthe control components 102 and 102′ operate together or not, the secondluminous layer 152 can be driven differently to change the saturationdegree of the entire pixel structure.

In other embodiment shown in FIG. 7, a third control component 102′ iselectrically coupled to a third electrode layer 132′ in the thirdregion, a third luminous layer 152′ is on the third electrode layer132′, and the opposite electrode layer 16 marked by the output voltageOVSS is on the third luminous layer 152′. The third TFT 12′, the thirdelectrode layer 132′, and the third luminous layer 152′ in the pixelstructure can be arranged by referring to the arrangement of the secondTFT 12, the second electrode layer 132, and the second luminous layer152 in FIG. 2. For example, the third TFT 12′ has a third gate terminal,a third source terminal, a third drain terminal, and a third channel.The third gate terminal of the third TFT 12′ is on the substrate 10. Thethird channel of the third TFT 12′ is coupled with the third sourceterminal and drain terminal of the third TFT 12′ such that electriccharges can flow between the third source terminal and drain terminal ofthe third TFT 12′. The third channel can be made of semiconductormaterial. One of the third source terminal or third drain terminal ofthe third control component 102′ (e.g. the third source terminal) iselectrically coupled to the third electrode layer 132′ in the thirdregion. The control components 101, 102 and 102′ are opaque and are inthe first region. For a top-emitting pixel structure, these controlcomponents are behind the reflection layer 14. In other words, thecontrol components 101, 102 and 102′ can be in the shadow that thereflection layer 14 is projected on the substrate 10.

The third electrode layer 132′, the third luminous layer 152′, and theopposite electrode layer 16 are electrically coupled to each other.Since the third TFT 12′, the third switch unit 127′, and the thirdluminous layer 152′ in FIG. 7 can be designed in their specificationaccording to actual requirements, the pixel structure in FIG. 7 is moreelastic than that in FIG. 6.

FIG. 8A is a schematic diagram of an embodiment of a display in thedisclosure. The display includes, for example, a driving circuit 801 aand a pixel matrix 802 a. The driving circuit 801 a is coupled with thepixel matrix 802 a to output a scan signal SC and a data signal DT tothe pixel matrix 802 a so that pixels of the pixel matrix 802 a aredriven to emit light to display images. The pixel matrix 802 a iscarried out by the pixel structure in the disclosure. The pixelstructure has, for example, the aforementioned first region and theaforementioned second region. FIG. 8B is a top view of an embodiment ofthe pixel matrix 802 a where the aforementioned opposite electrode layer16 of each pixel structure is not shown. The adjacent pixels in thepixel matrix 802 a are arranged as shown in FIG. 8B so that firstregions (or second regions) of pixels in the same pixel line are alignedas a first line and second regions of pixels in the same pixel line arealigned as a second line. The first lines and the second lines areseparated from each other by blocking layers, and each first line isbetween adjacent two of the second lines. For example, first luminouslayers 801R, 801G, 801B, 805R, 805G and 805B in the first regions of apixel line are aligned in one first line while first luminous layers803R, 803G, 803B, 807R, 807G and 807B in the first regions of anotherpixel line are aligned in one adjacent first line. Similarly, secondluminous layers 802R, 802G, 802B, 806R, 806G and 806B in second regionsof a pixel line are aligned in one second line while second luminouslayers 804R, 804G, 804B, 808R, 808G and 808B in second regions ofanother pixel line are aligned in one adjacent second line. The firstand second lines (i.e. the pixel lines) are vertically arranged inparallel as shown in FIG. 8B. Alternately, the first and second lines(i.e. the pixel lines) are horizontally arranged in parallel or have anyangle with a horizontal line of the drawing.

The pixel structure may further include the aforementioned firstluminous layer 151 in the first region, the aforementioned secondluminous layer 152 in the second region, the aforementioned firstcontrol component 101, and the aforementioned second control component102. The first control component 101 is controlled by the scan signal SCand the data signal DT to drive the first luminous layer 151 to emitlight, and the second control component 102 is controlled by the scansignal SC and the data signal DT to drive the second luminous layer 152to emit light.

Please refer to FIGS. 9A, 9B and 9C. FIG. 9A schematically illustratesthe first image displayed by the first luminous layer 151, FIG. 9Bschematically illustrates the second image displayed by the secondluminous layer 152, and the FIG. 9C schematically illustrates the frameimage shown on the display. The first and second images in FIG. 9A andFIG. 9B and the frame image in FIG. 9C are simply drawn by differentstraight sloping lines with different meshes and can be dynamic images.Two different straight sloping lines represent two differenttransparency values of image, respectively.

As shown in FIGS. 9A, 9B and 9C, in an embodiment, the driving circuit801 a drives the first luminous layer 151 and the second luminous layer152 by the data signal DT to emit light of images for the display todisplay. Specifically, the light emitted by the first luminous layer 151forms a first image that is opaque, as shown in FIG. 9A. The lightemitted by the second luminous layer 152 forms a second image that istransparent or translucent, as shown in FIG. 9B. The first and secondimages are combined to form a combined frame image on screen, as shownin FIG. 9C. In this embodiment, because the first luminous layer 151 andthe second luminous layer 152 are driven by the data signal DT, thefirst image 151 and the second image152 have difference in brightnessand contrast but show image information carried by the data signal DT.The driving circuit 801 a adjusts the current flowing through the firstluminous layer 151 and the current flowing through the second luminouslayer 152, to control the luminances of the first luminous layer 151 andthe second luminous layer 152. Controlling the luminances of the firstluminous layer 151 and the second luminous layer 152 is to control thecontrast and brightness of the first image and the contrast andbrightness of the second image, whereby the ratio of the first image tothe second image can be controlled during the combination of the firstand second images to harmonize the brightness or contrast of frameimages.

In another embodiment, FIGS. 10A to 10C also illustrate the first image,the second image, and the frame image respectively, and the drawingmanner in FIGS. 10A to 10C can be referred to that in FIGS. 9A to 9C andwill not be repeated hereinafter. The driving circuit drives the firstluminous layer 151 by the data signal DT and drives the second luminouslayer 152 by another data signal DT′. Different from the embodimentillustrated by FIGS. 9A to 9C, the display in this embodimentillustrated by FIGS. 10A to 10C drives the first luminous layer 151 andthe second luminous layer 152 respectively by different signals.Therefore, the image content, brightness, and/or contrast of the firstimage are different from those of the second image while the frame imageon the display simultaneously shows the first image 151 and the secondimage 152. The driving circuit adjusts the current flowing through thefirst luminous layer and the current flowing through the second luminouslayer to control the light-emitting of the first luminous layer 151 andthe second luminous layer 152. Controlling the light-emitting of thefirst luminous layer 151 and the second luminous layer 152 is to controlthe contrast and brightness of the first and second images, therebycontrolling the ratio of first image to second image during combiningthem.

In an embodiment, the pixel structure further includes a third luminouslayer 152′ in the third region that can be deduced by the descriptionrelated to FIG. 2 and FIG. 6, the driving circuit drives the firstluminous layer 151 by the data signal DT and drives the second luminouslayer 152 and the third luminous layer 152′ by the data signal DT′.Moreover, the brightness and contrast of the second image can slightlybe adjusted by the second luminous layer 152 and the third luminouslayer 152′.

In the disclosure, the transparent penetrative region of a display (i.e.the second region) is disposed with the second luminous layer anddifferent control components. When the second control component does notoperate, the pixel structure may achieve the highest transparent degree,and when the second control component operates, the pixel structure mayhave high contrast.

What is claimed is:
 1. An organic light-emitting diode pixel structurehaving a first region and a second region, comprising: a substrateextended to the first region and the second region; a first controlcomponent located in the first region on the substrate; a firstelectrode layer located in the first region, and electrically coupled tothe first control component; a reflection layer disposed between thefirst electrode layer and the substrate in the first region; a firstluminous layer located on the first electrode layer, electricallycoupled to the first electrode layer; a second control component locatedin the first region on the substrate; a second electrode layer locatedin the second region and electrically coupled to the second controlcomponent in the first region; a second luminous layer located on thesecond electrode layer and electrically coupled to the second electrodelayer; and an opposite electrode layer located on the first luminouslayer and the second luminous layer and electrically coupled to thefirst luminous layer and the second luminous layer, wherein the secondelectrode layer and the opposite electrode layer are made of transparentmaterial, and there has no reflective layer in the second region.
 2. Theorganic light-emitting diode pixel structure according to claim 1,wherein the first control component comprises a first thin filmtransistor having a first gate terminal, a first source terminal, afirst drain terminal, and a first channel, one of the first sourceterminal and first drain terminal of the first control component iselectrically coupled to the first electrode layer, the first gateterminal of the first control component is disposed on the substrate andis selectively, electrically coupled to a first data line, the firstdata line is configured to provide the first gate terminal of the firstcontrol component with a first data signal, the first channel iselectrically coupled to the first source terminal and first drainterminal of the first control component; and the second controlcomponent comprises a second thin film transistor having a second gateterminal, a second source terminal, a second drain terminal, and asecond channel, one of the second source terminal and second drainterminal of the second control component is electrically coupled to thesecond electrode layer, the second gate terminal of the second controlcomponent is located on the substrate, the second channel iselectrically coupled to the second source terminal and second drainterminal of the second control component.
 3. The organic light-emittingdiode pixel structure according to claim 2, wherein the second gateterminal of the second control component is electrically coupled to thefirst gate terminal of the first control component.
 4. The organiclight-emitting diode pixel structure according to claim 2, wherein thesecond gate terminal of the second control component is electricallycoupled to a second data line, the second data line is configured toprovide the second gate terminal of the second control component with asecond data signal, and the first data signal is different from thesecond data signal.
 5. The organic light-emitting diode pixel structureaccording to claim 2, further comprising: a gate insulation layerpartially located on the substrate, the first control component and thesecond control component being located on the gate insulation layerpartially.
 6. The organic light-emitting diode pixel structure accordingto claim 2, wherein the second control component further comprises aswitch unit that is controlled by a switch signal, and the other one ofthe second source terminal and second drain terminal of the secondcontrol component is electrically coupled to the switch unit.
 7. Theorganic light-emitting diode pixel structure according to claim 6,wherein the second gate terminal of the second control component iselectrically coupled to the first gate terminal of the first controlcomponent.
 8. The organic light-emitting diode pixel structure accordingto claim 6, wherein the second gate terminal of the second controlcomponent is electrically coupled to a second data line, the second dataline provides the second gate terminal of the second control componentwith a second data signal, and the first data signal is different fromthe second data signal.
 9. The organic light-emitting diode pixelstructure according to claim 6, further comprising: a gate insulationlayer partially located on the substrate, the first control componentand the second control component being located on the gate insulationlayer partially.
 10. The organic light-emitting diode pixel structureaccording to claim 2, wherein the second control component furthercomprises a switch unit, and the switch unit is controlled by a switchsignal and is electrically coupled to the second electrode layer and thesecond thin film transistor.
 11. The organic light-emitting diode pixelstructure according to claim 10, wherein the second gate terminal of thesecond control component is electrically coupled to the first gateterminal of the first control component.
 12. The organic light-emittingdiode pixel structure according to claim 10, wherein the second gateterminal of the second control component is electrically coupled to asecond data line, the second data line provides the second gate terminalof the second control component with a second data signal, and the firstdata signal is different from the second data signal.
 13. The organiclight-emitting diode pixel structure according to claim 10, furthercomprising: a gate insulation layer partially located on the substrate,the first control component and the second control component beinglocated on the gate insulation layer partially.
 14. The organiclight-emitting diode pixel structure according to claim 1, furthercomprising: a partition layer located on the substrate and between thefirst luminous layer and the second luminous layer.
 15. The organiclight-emitting diode pixel structure according to claim 1, furtherhaving a third region and comprising: a third control component locatedon the substrate; a third electrode layer being transparent, located inthe third region, and electrically coupled to the third controlcomponent; and a third luminous layer located on the third electrodelayer and electrically coupled to the third electrode layer; wherein thesubstrate is further extended to the third region.
 16. The organiclight-emitting diode pixel structure according to claim 1, wherein thesecond region is transparent or translucent.
 17. The organiclight-emitting diode pixel structure according to claim 1, wherein thefirst luminous layer emits first light, the second luminous layer emitssecond light, and the first light and the second light are the same incolor.
 18. A display, comprising: the organic light-emitting diode pixelstructures in claim 1, arranged in a matrix form; and a driving circuitelectrical coupled to the organic light-emitting diode pixel structures,configured to drive the first control component according to first imagedata to control the first luminous layers to generate a first imageaccording to the first image data, and further configured to drive thesecond control components according to second image data to control thesecond luminous layers to generate a second image according to thesecond image data, wherein the first image is opaque, and the secondimage is transparent or translucent.